Providing pinnacle-performance views at a bargain-basement price, our new Orion 20x80 Astro-Binoculars pack a visual punch usually reserved for astronomy binoculars with a much larger price tag. With top-quality features such as high-transmission BAK 4 prisms, fully multi-coated optics, and gigantic 80mm (3.14") aperture objective lenses, the affordably-priced Orion 20x80 Astro-Binoculars will astound you and your friends with its amazing viewing capability.

The giant 80mm objective lenses gobble up light from objects in the night sky, yielding bright views with exceptional contrast and sharpness. These big and powerful binoculars gather over 30% more light than 70mm aperture models for brighter views of cosmic curiosities. An integrated heavy-duty tripod adapter lets you easily attach the binocular to any field tripod or binocular mount, which is recommended for extended use. So go ahead, grab more light from the night sky with a pair of Orion 20x80 Astro-Binoculars tonight!

Warranty

Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only. For complete warranty details contact us at 800-676-1343.

Warning

Please note this product was not designed or intended by the manufacturer for use by a child 12 years of age or younger.

Magnification

A measure of the enlargement of an object seen through an optical instrument. More specifically, it is a measure of the angle subtended by an image viewed with optical aid divided by the angle subtended by the same object without optical aid. Magnification is determined by dividing the focal length of the telescope (or binocular) by that of the eyepiece. Hence a telescope with a 1200mm focal length and an eyepiece of 40mm yields a magnification of 30x. The human eye is considered 1x magnification.

Optical diameter

The optical diameter (also known as aperture), is the size of the telescope's main light collecting lens or mirror, measured in millimeters or inches. As the diameter increases, more light is collected and the resolution increases.

Field of view - angular

The field of view expressed as part of a 360-degree circle. Holding your pinky finger out at arms length is approximately 1-deg wide. To convert this to the linear measurement of "feet at a thousand yards", multiply by 52.5. For example, at 1000 yards distance, a 7-deg binocular will see a width of 367.5 feet (7 x 52.5)

Apparent field of view

The edge-to-edge angular diameter of the light emerging from the eyepiece as seen by the eye. It is an inherent specification for a given eyepiece type or design. The apparent field of view of an eyepiece is directly related to the true field of view seen through the telescope; for a given focal length eyepiece, the greater the eyepiece's apparent field of view, the greater area of sky will be seen.

Eye relief

The distance, measured in millimeters, between the observer's eye and the eyepiece lens in which the entire field of view remains visible. Eye relief varies with the optical design but generally increases with decreasing magnification. Long eye relief is advantageous for observers who wear glasses, as they don't have to put their eye directly on the eyepiece to see the entire field of view, nor do they have to remove their eyewear.

Exit pupil

The diameter of the circle of light exiting the telescope eyepiece. It appears as a distinct disk when the telescope is pointed at a bright source like the Moon. Also known as the Ramsden disk, the exit pupil varies with both aperture and magnification.

Near focus

The minimal distance at which a binocular and/or spotting scopes can attain focus. Near focus is an important quality for bird watchers and wildlife devotees who want to get as close as possible to their quarry.

Coatings

Lenses are coated with an antireflective material to ensure that as little light as possible is reflected away, so more gets to your eye. Good lenses are at least "fully coated," with a single layer of magnesium fluoride applied to each air-to-glass lens surface. Multiple layers of coatings are even more effective; the term "multi-coated" means one or more lens surfaces have multiple coatings. "Fully multi-coated" is even better, meaning that all lens surfaces are multiple-layer coated.
Mirror star diagonals are coated with a reflective material similar to telescope mirrors in order to reflect the light into the eyepiece. Standard aluminum coatings reflect between 88%-92%, and enhanced aluminum reflects 97%.
Dielectric coatings use a different process to deposit a coating that reflects 99% of the light. In addition to the higher reflectivity, Dielectric coatings are much more durable than aluminum coatings, so they last longer and can be cleaned with less risk of damage.

Prism

Porro Prisms:
A binocular prism system that contains two right-angle prisms in each barrel offset from one another, requiring that the objective lenses be spaced further apart than the eyepieces. Optically, porro prisms often perform better than their roof prism counterparts.
Roof Prisms:
A compact binocular prism system that allows the objective lenses to line up directly with the eyepieces and hence yields a more portable binocular. Roof prism binoculars lose slightly more light to reflections than porro prism binoculars. High-quality roof prism binoculars compensate for this with special optical coatings.

Warranty

This warranty gives you specific legal rights. It is not intended to remove or restrict your other legal rights under applicable local consumer law; your state or national statutory consumer rights governing the sale of consumer goods remain fully applicable.

One year

Shipping Info

Orders received by 1pm Eastern Time for in-stock items ship the same business day. Orders received after 1pm will ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.

The Orion Paragon XHD field tripod is strong enough to hold binoculars, a camera, spotting scope, or small telescope - anything up to 10 lbs. Recently upgraded with easy-to-use lever locks and graduated marks for quick and easy leveling.

You've just bought your first telescope, but now what? The Orion Beginning Stargazer's Toolkit is the perfect addition! This best selling kit includes a planisphere star atlas, Discover the Stars book, Orion MoonMap 260, and a red flashlight.

Need for a good way to start identifying constellations? The Orion Star Target Planisphere is the perfect telescope accessory! Designed for 30-50 deg North latitude and includes simple instructions and viewing tips. Just dial in the date and time!

If you are an avid astronomer you know that you should always use red light instead of white to help protet your night vision. The Orion RedBeam II LED Flashlight has adjustable brightness which lets you observe without ruining your night vision.

The Orion Paragon-Plus Binoucular Mount and Tripod provides relaxing views for hours on end with binoculars up to 80mm aperture. Features a clever design that allows the user to raise and lower the tripod while the binoculars stay fixed on target.

At Orion, we are committed to sharing our knowledge and passion for astronomy and astrophotography with the amateur astronomy community. Visit the Orion Community Center for in-depth information on telescopes, binoculars, and astrophotography. You can find astrophotography "how to" tips and share your best astronomy pictures here. Submit astronomy articles, events, and reviews, and even become a featured Orion customer!